Aubert, B;
Barate, R;
Boutigny, D;
Gaillard, JM;
Hicheur, A;
Karyotakis, Y;
Lees, JP;
... BABAR Collaboration, .; + view all
(2004)
Measurements of the mass and width of the eta(c) meson and of an eta(c)(2S) candidate.
PHYS REV LETT
, 92
(14)
, Article 142002. 10.1103/PhysRevLett.92.142002.
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Abstract
The mass m(etac) and total width Gamma(tot)(etac) of the eta(c) meson have been measured in two-photon interactions at the SLAC e(+)e(-) asymmetric B Factory with the BABAR detector. With a sample of approximately 2500 reconstructed eta(c) --> (KSK+/-)-K-0 pi(-/+) decays in 88 fb(-1) of data, the results are m(etac) = 2982.5 +/- 1.1 (stat) +/- 0.9(syst) MeV/c(2) and Gamma(tot)(etac) = 34.3 +/- 2.3(stat) +/- 0.9(syst) MeV/c(2). Using the same decay mode, a second resonance with 112 +/- 24 events is observed with a mass of 3630.8 +/- 3.4(stat) +/- 1.0(syst) MeV/c(2) and width of 17.0 +/- 8.3(stat) +/- 2.5(syst) MeV/c(2). This observation is consistent with expectations for the eta(c)(2S) state.
Type: | Article |
---|---|
Title: | Measurements of the mass and width of the eta(c) meson and of an eta(c)(2S) candidate |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1103/PhysRevLett.92.142002 |
Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.92.142002 |
Language: | English |
Additional information: | The American Physical Society |
Keywords: | QUANTUM CHROMODYNAMICS, STATE, SPECTROSCOPY, ETA'(C), SEARCH, LEP |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
URI: | https://discovery.ucl.ac.uk/id/eprint/1303659 |
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